Device for preventing backfire in the carburetor or inlet pipe of internal-combustion engines



w w. E; @LLOGLY. v DEVICE FOR PREVENTING BACKFIRE IN THE CARBURETOR'OR INLET PIPEDE-INTERNAL COMBUSTION ENGINES.

APPLICATION FILED MAY 12 1921-- 1,414,08L Patented Apr 25, 1922.

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wruram Enwann GOLLOGLY, or menu, QUEENSLAND, ans'rmma.

DEVICE FOR PREVENTING BACKFIRE mama CARBURETOR OR'INLET PIPE or INTER- HAL-COMBUSTION ENGINES. I

Specification of Letters Patent Patented Apr. 1922.

Application filed May 12, 1921. Serial No. 468,968.

To all whom it may concern:

Be it known that 1, WILLIAM EDWARD GOLLOGLY, a subject of the King of Great Britain and Ireland, residing at Francis Street, Ingham, a post town in the division of North Queensland, State of Queensland, Commonwealth'of Australia, have invented certain new and useful Improvements in a Device for Preventing Backfire in the Car buretoror Inlet Pipe of Internal-Combustion Engines, of which the following is a specification 'This invention relates to the prevention of fire in the induction pipe or carburetor of internal combustion engines in the event of the engine back-firing, and has for its object the provision of a simple and eflicient means for preventing pre-ignited charges from blowing back or returning to the carburetor.

It is well known that pre-ignition of a gaseous chargacommonly known as a backfire, is apt to cause the carburetor to take fire. The present invention aims at imprisoning the pre-ignited charge between the carburetor and the 1 engine and delivering s'uch'charges either into the atmosphere or to the engine silencer in a simple and eflicientmanner.- V

Referring to the drawings Figure 1. is a side elevation of the invention applied to the manifold of an internal combustion engine.

I Figure 2. is apart sectional plan of Figure' 1'. I

Figure 3. is a part sectional end elevation of Figure 2. 1

The invention isassociated with an inlet or induction pipe 1. communicating atone end-with a carburetor and secured at its other end to a'chamber 2. having an inlet port 3 and a valve stem guide 4:. around which is a valve seating 5. Resting upon the seating is the head 6' of a non-return valve having a stem 7 passing through the' guide l. Encircling the'stem 7 is a coiled spring 8. one end of which bears against the guide 4' and the other end of which is retained by a nut 9. Y

Formed in the chamber 2 areo posite induction parts indicated at 10. ecured to the chamber 2 and communicating with the ports 10 are opposite induction branches 11. The branches 11 pass to the manifold 12 of the engine and are secured thereto by flanges or the like.

Formed in the chamber 2, adjacent the inlet port 3, is an escape'port 13 having a valve seating 14 encircling a valve stem guide 15.

Resting upon thev seating 14 is the head 16 of an escape valve having a stem 17 passing through the guide 15. Encircling the stem 17 is a coiled spring 18 one end of which bears against the guide 15 and the other end of which is retained by a nut 19. Secured to the chamber 2 by a flange or the like and passing from the port 13 is a delivery pipe 20. This may communicate with the engine silencer. l

The cycle of operationswith the invention is as follows Suction from the engine passes from the manifold 12 through the branches 11 to the chamber 2 and lifts the head 6 of'the non return valve from its seating 5, thereby compressing the spring 8. The fuel charge passes from the induction pipe (1), through the port 3 into the chamber 2, and along the inmunication with the induction pipe 1 is prevented by the closed non-return valve. The escape valve, however, by the back pressure is opened and the head 16 moving from its seating 14 permits the pre-ig'nited charge to pass through the escape port into the delivery pipe 20. The pipe 20 may communicate direct with the atmosphere or with the en gine silencer. Immediately suction by the engine is resumed, the escape valve closes with the assistance of its spring 18 and the non-return valve opens. Preferably the spring 18 is weaker than the spring 8 to permit of the non-return valve moving more rapidly than the escape valve.

It is to be particularly noted that the I chamber 2 is here shown as a spherical member-and that the valve parts controlling'the inlet and outlet of the products are carried by and connected directly to this spherical member. Therefore, the improvement is" readily usable as a unit, and can be readily now employed being simply cut and formed for connection with this unit which of course is otherwise complete.

Although the invention has been herein described, as applied to an internal combustion engine, it will be apparent to those skilled in the art that it may be apphed wlth advantage to other elements or devices, such ,as gas mains by providing a branch pipe or an enlargement in the main, and such adap-- tations are to be considered as within the scope of the invention.

What I claim is 2- A unit device for preventing back fire from an internal combustion engine,,comprising a hollow spherical member having diametric openings communicating unobstructedly with the intake manifold, an opening arranged between said diametric openings and communicating with the carburetor, a va1ve carried by said spherical ereper member for controlling the opening from the carburetor, said valve opening towards the spherical member and having a spring to normally hold the valve in closed position,

an exhaust pipe communicating with the member intermediate the, manifold communications, a valve closing the exhaust pipe opening from the member, said valve opening'towards the exhaust pipe and having a spring of less strength than the first mentioned spring to normally hold the valve closed, said valves and cooperating parts being carried Wholly by said spherical hollow member, whereby the device is complete as a unit for installation.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

WlLl..lAM EDWARD GOILLOGLY.

Witnesses:

J. P. RYAN, JAMES G. DENNY. 

